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sys/v4l2/v4l2src_calls.c: Check whether the device supports setting the framerate before trying to set it and then po...

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Original commit message from CVS:
Based on patch by: William M. Brack <wbrack at mmm com hk>
* sys/v4l2/v4l2src_calls.c: (fractions_are_equal),
(gst_v4l2src_set_capture):
Check whether the device supports setting the framerate before
trying to set it and then posting a warning or error if it doesn't
work (#516649, #520092). Also compare fractions more correctly.
This commit is contained in:
William M. Brack 2008-03-25 12:33:09 +00:00 committed by Tim-Philipp Müller
parent 4271a5523d
commit e605a94e40
2 changed files with 61 additions and 28 deletions
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10
ChangeLog
View file

@ -1,3 +1,13 @@
2008-03-25 Tim-Philipp Müller <tim at centricular dot net>
Based on patch by: William M. Brack <wbrack at mmm com hk>
* sys/v4l2/v4l2src_calls.c: (fractions_are_equal),
(gst_v4l2src_set_capture):
Check whether the device supports setting the framerate before
trying to set it and then posting a warning or error if it doesn't
work (#516649, #520092). Also compare fractions more correctly.
2008-03-23 Tim-Philipp Müller <tim at centricular dot net>
* gst/goom/Makefile.am:

79
sys/v4l2/v4l2src_calls.c
View file

@ -1111,6 +1111,19 @@ qbuf_failed:
*/
}
static gboolean
fractions_are_equal (gint num1, gint den1, gint num2, gint den2)
{
GValue fraction1 = { 0, }, fraction2 = {
0,};
g_value_init (&fraction1, GST_TYPE_FRACTION);
g_value_init (&fraction2, GST_TYPE_FRACTION);
gst_value_set_fraction (&fraction1, num1, den1);
gst_value_set_fraction (&fraction2, num2, den2);
/* we know we don't have to unset the values in this case */
return (gst_value_compare (&fraction1, &fraction2) == GST_VALUE_EQUAL);
}
/******************************************************
* gst_v4l2src_set_capture():
@ -1153,32 +1166,52 @@ gst_v4l2src_set_capture (GstV4l2Src * v4l2src, guint32 pixelformat,
if (format.fmt.pix.pixelformat != pixelformat)
goto invalid_pixelformat;
/* Is there a reason we require the caller to always specify a framerate? */
GST_LOG_OBJECT (v4l2src, "Desired framerate: %u/%u", fps_n, fps_d);
memset (&stream, 0x00, sizeof (struct v4l2_streamparm));
stream.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (ioctl (fd, VIDIOC_G_PARM, &stream) < 0) {
GST_ELEMENT_WARNING (v4l2src, RESOURCE, SETTINGS,
(_("Could not get parameters on device '%s'"),
v4l2src->v4l2object->videodev), GST_ERROR_SYSTEM);
} else { /* seems no point in SET, if can't get GET */
/* Note: V4L2 gives us the frame interval, we need the frame rate */
stream.parm.capture.timeperframe.numerator = fps_d;
stream.parm.capture.timeperframe.denominator = fps_n;
if (ioctl (fd, VIDIOC_S_PARM, &stream) < 0) {
GST_ELEMENT_WARNING (v4l2src, RESOURCE, SETTINGS,
(_("Could not set parameters on device '%s'"),
v4l2src->v4l2object->videodev), GST_ERROR_SYSTEM);
/* FIXME: better test for fraction equality */
if (stream.parm.capture.timeperframe.numerator != fps_d
|| stream.parm.capture.timeperframe.denominator != fps_n)
goto invalid_framerate;
}
v4l2src->fps_d = fps_d;
v4l2src->fps_n = fps_n;
goto done;
}
/* Note: V4L2 provides the frame interval, we have the frame rate */
if (fractions_are_equal (stream.parm.capture.timeperframe.numerator,
stream.parm.capture.timeperframe.denominator, fps_d, fps_n)) {
GST_LOG_OBJECT (v4l2src, "Desired framerate already set, nothing to do");
goto done;
}
/* We want to change the frame rate, so check whether we can. Some cheap USB
* cameras don't have the capability */
if ((stream.parm.capture.capability & V4L2_CAP_TIMEPERFRAME) == 0) {
GST_DEBUG_OBJECT (v4l2src, "Not setting framerate (not supported)");
goto done;
}
GST_LOG_OBJECT (v4l2src, "Setting framerate to %u/%u", fps_n, fps_d);
/* Note: V4L2 wants the frame interval, we have the frame rate */
stream.parm.capture.timeperframe.numerator = fps_d;
stream.parm.capture.timeperframe.denominator = fps_n;
/* some cheap USB cam's won't accept any change */
if (ioctl (fd, VIDIOC_S_PARM, &stream) < 0) {
GST_ELEMENT_WARNING (v4l2src, RESOURCE, SETTINGS,
(_("Video input device did not accept new frame rate setting.")),
GST_ERROR_SYSTEM);
goto done;
}
v4l2src->fps_n = fps_n;
v4l2src->fps_d = fps_d;
GST_INFO_OBJECT (v4l2src, "Set framerate to %u/%u", fps_n, fps_d);
done:
return TRUE;
/* ERRORS */
@ -1219,16 +1252,6 @@ invalid_pixelformat:
GST_FOURCC_ARGS (format.fmt.pix.pixelformat)));
return FALSE;
}
invalid_framerate:
{
GST_ELEMENT_ERROR (v4l2src, RESOURCE, SETTINGS,
(_("Device '%s' cannot capture at %d/%d frames per second"),
v4l2src->v4l2object->videodev, fps_n, fps_d),
("Tried to capture at %d/%d fps, but device returned %d/%d fps",
fps_n, fps_d, stream.parm.capture.timeperframe.denominator,
stream.parm.capture.timeperframe.numerator));
return FALSE;
}
}
/******************************************************